Malicious PDF — malware analysis report

Static analysis result for SHA-256 7821452b1cfb3390…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 16:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c662b8a0ee1cd37731446ea582017284 SHA-1: f038f1df670a1b94fa588020e2159914d074a03b SHA-256: 7821452b1cfb3390aedacefc7a0b53748dfbc062830f3b79f0c68067d258c743
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Session Tokens T1056.004 Web Browser

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a fake CAPTCHA and an MFA lure, indicating an attempt to harvest credentials or session tokens. The document also includes a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mynotary.ca/sites/all/sites/mynotary.ca/files/setenibo.pdf In PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jabamilisidetavamubeke.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/rugifefurivupabekowutanoj.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/rojurodu.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/bitomajopatubipanewimaf.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/20494618272.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/dozetinobebodafikagan.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/785197384.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xinexirulaxek.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/nojesafoja.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/litewopilagedo.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/lojusofewopok.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/70344447004.pdfIn PDF document text
    • http://a-pluset.com/userfiles/8322887172.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ur8101ug4d3q7jn0mf687rueh6/sidodil.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/14884822085.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/89296828950.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/5621a0d6db90bb9b36d6d116908b0977.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/90660373168.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/gepetijinadotuniri.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18274431101.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/13340339214.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wuvijaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+instagram+password+hack+instagram+account+no+surveyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 11364 bytes
SHA-256: 487ed672b7e94f58211fdad522a37e340f2e55e29b65604e4f4903c222279bf2
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 17396 bytes
SHA-256: ad1203e8deb40f8877561ba0e4cbfa9e852a1f9936b22505be1a5d7125223cda
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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